The Future of Analog IC Technology
19V, 2A, 40µA IQ, High-Efficiency,
Constant-On-Time, Step-Down Converter
in a QFN (2mmx3mm) Package
The MP2321 is a fully-integrated, high-
efficiency, synchronous, step-down, switch-
mode converter with 40μA of quiescent current.
The MP2321 achieves 2A of continuous output
current over a wide input supply range with
excellent load and line regulation and can
operate with high efficiency over a wide output
current load range. The MP2321 is optimized
for battery-operated applications and
applications requiring high light-load efficiency.
With constant-on-time (COT) control, the
MP2321 provides very fast transient response,
easy loop design, and very tight output
Full protection features include short-circuit
protection (SCP), over-current protection (OCP),
under-voltage protection (UVP), and thermal
The MP2321 requires a minimal number of
readily available, standard, external
components and is available in a space-saving
QFN-14 (2mmx3mm) package.
4V to 19V Operating Input Range
2A Output Current
40μA Quiescent Current
Output Adjustable from 0.6V
110mΩ/40mΩ High-Side/Low-Side RDS(ON)
for Internal Power MOSFETs
Power Good Indicator
Programmable Soft-Start Time
Forced PWM or Auto PFM/PWM Mode
Programmable Switching Frequency
Short-Circuit Protection: Hiccup Mode
Available in a QFN-14 (2mmx3mm)
Solid State Drives
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
MP2321 Rev. 1.1
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